Dynamo-electric machine.



C. S. COOK.

UYNAMO ELECTRIC MACHINE.

APPLICATION FILED Nov; 25. I914.

Patented July 2, 1918.

INVENTOR Clmrhs 5. Cool WITNESSES Jag/ax ORNEY UNITED STATES PATENTOFFICE.

CHARLES S. COOK, OF PITTSBURGH. PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSEELECTRIC AND MANUFACTURING COMPANY, A'CORPORATION OF PENNSYLVANIA.

DYNAMO-EL'ECTRIC MACHINE.

Specification of Letters Patent.

Patented July 2, 1918.

Application filed November 25, 1914. Serial No. 873,903.

To all whom it may concern:

Be it known that I, Cnanuss S. Coon, a citizen of the United States, anda resident of Pittsburgh. in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in Dynamolllectric Machines. of which the following is a specification.

My invention relatesto dynamo-electric machines. and more particularlyto ventilatin; structures for railway motors.

One of the objects of my invention is to provide a structure of theabove-indicated character which shall be simple in arrangement andconstruction. eltective and ellicicnt in operation. and which shall beparticularly adapted to provide a direct unidirectional circulation ofventilating air through the longitudinal ventilating ducts of thearmature and through the space between the periphery of the armature andthe field magnet structure.

lleretofore. when forced ventilation has been applied to railwa motors.it has been customary to a rrange t to parts in such manner that the airis taken in at one end of the motor. circulated through the air ducts inone direction and thence returned back through the air gap anddischarged at the same end of the motor that it was introduced.

According to my present invention. l propose to take the air in at oneend. carry it directly through the ducts and air gap in the samedirection and discharge it at the other end of the machine. In order toaccomplish this result I employ a double set of concentrically relatedfan blades which are associated with one end of the armature and are sodisposed and adapted that the inner set of blades circulates air throughthe longitudinal ducts, while the outer set of blades .ell'ects thecirculation of air through the space between the armature and fieldmagnet structure.

'In its broadest aspect. my invention eontemplates ventilating means ofthe class mentioncd and is entirely independent of the particular typeofrotating and stationary members, that is, the rotor may constitute thefield structure while the armature'may com rise the stator.

ll y invention may best be understoml by reference to the accompanyingdrawing. in which Figure l is a view, partially in section and partiallyin side elevation, of a portion of a dynamo-electric machine emodying myinvention; and Fig. 2 is a view, partially in section and partially inend elevation, of a portion of the fan structure shown in Fig. 1.

Referring to the drawing, the apparatus shown comprises a field magnetframe 1. a plurality of bearing houses .2 and 3, a rotatable armature 4and a fan structure 5.

The field magnet frame 1 is of the wellknown box type and is providedwith a plurality of polar project-ions 6, each of which carries a fieldcoil 7. Moreover, the frame 1 is provided with an o ening 8 at thecommutator end over whici is placed a cover member 9. having a pluralityof protected inlet openings 10 therein through which ventilating air maybe drawn. A plurality of outlet openings 11 are also provided at theother end of the frame 1. y

The bearing housings 2 and 3 may be of any familiar type of constructionand are fitted into openings 12 and 13 of the ends of the frame I andsecured in position by any suitable means. The-housing 3 is providedwith a plurality of sets of outletopenings 13 and 13". shaft 14 isrotatably mounted within the housings 2 and 3, bearing members 15 and 16being" employed in accordance with customary practice.

The structural details of the armature; form no mutgpial part of mypresent invention, except o far as the fan structure 5 is concerned, andsaid armature embodies a core member 18, preferably of laminatedmaterial, a plurality of coils 19, a commutator spider 20 for supportinga commutator 21, and a coil-supportin end member which constitutes apart 0 the fan structure 5. The laminated core member 18 is providedwith a lurality of longitudinally disposed ventilating ducts 23 that arepre erably arranged in staggered relation, and commutator spider 20 iscorrespondingly provided 100 ture coils 19 in the usual manner, and said105 body member 26 is also provided with a plurality of openings 27 thatare so disposed as to register with the several longitudinal ventilatingducts 23. The Openings 27 are elongated in a radial direction in or-111) der to communicate with the staggered ducts 23 and are separated,the one from the other, by means of radially disposed members or blades28 that )rojeet radially outwardly beyond the perip iery of the armature4 and are divided into two concentric sets of blades 30 and 31 by anannular inclined deflecting partition 32.

By reason of the deflecting partition 32 and the double fan bladearrangement, the inner set of blades 31 serves to draw air into themotor through the inlet openings and thence through the longitudinalduets 23, after which it is discharged through openings 13 and 13" inthe end housing 3, while another circulation of air is effected from theinlet openings 10 through the air gap, or space between the armature andfield magnet structures, and thence is discharged through the frameoutlet openings 11. The, inner and outer sets 31 and 30 of fan bladestherefore, function to produce a direct and unidirectional circulationof ventilating air through the armature ducts and the air gap, the airbeing taken in at one end of the machine and discharged at the other.

Although I have, for illustrative purposes, shown and described myinvention as embodymg specific structural details and arrangement andlocation of parts. those skilled in the art will readily understand thatmy invention is not so restricted, and that various modifications maybe'efl'ected therein without departing from the spirit and scopethereof.

I claim as my invention:

1. A dynamo-electric machine comprising a stationary field-magnet framehaving inlet and outlet openings, a rotatable armature havinglongitudinal ventilating duets, an end member having openings therein torow ister with said ventilating ducts and having intermediate radiallydisposed fan blades projecting beyond the periphery of said armature,and an annular inclined deflecting partition for dividing said bladesinto concentric sets for respectively effecting a circulation of air inindependent paths through said dynamo-electric machine, one of saidindependent paths consisting of said air ducts, openings in said endmember, over one set of said fan blades and through openings in saidframe, said other path consisting of the air gap over the other set offan blades and through another opening in said frame.

2. In a box-type inelosed railway motor, the combination with a framehaving inlet and outlet openings respectively provided in the oppositeends thereof, bearing housings associated with the ends of said frameand one of said housings having outlet openings therein. and a rotatablearmature supported by said housings and having longitudinal ventilatingducts, of concentrically related sets of fan blades associated with theend of the armature adjacent to said outlet openings, the innerset ofblades being adapted to draw air from said inlet opening through saidducts and discharge it through the housing outlet openings, and theouter set of blades being adapted to draw air from said inlet openingthrough the air gap and discharge it through said frame outlet openings.

In testimony whereof, I have hereunto subscribed my name this 19th dayof Nov.

CHARLES S. COOK. Witnesses ELLA M. Srnm,

R R. "nuns.

